This section is a guide on how to deploy a smart contract on the B² Network using Hardhat .
Hardhat is a popular smart contract development frameworks. It is used in the B² rollup as a default for deploying and automatically verifying smart contracts.
Initial setup
Get some test BTC from Bitcoin testnet faucet, and cross chain the test BTC from Bitcoin testnet to B² Network Testnet by test bridge.
Install Hardhat and dependencies
Copy npm install --save-dev ethers hardhat @nomiclabs/hardhat-waffle ethereum-waffle chai @nomiclabs/hardhat-ethers dotenv
Run npx hardhat init to init a new project, and you will be shown some options to facilitate project creation:
Copy $ npx hardhat init
888 888 888 888 888
888 888 888 888 888
888 888 888 888 888
8888888888 8888b. 888d888 .d88888 88888b. 8888b. 888888
888 888 "88b 888P" d88" 888 888 "88b "88b 888
888 888 .d888888 888 888 888 888 888 .d888888 888
888 888 888 888 888 Y88b 888 888 888 888 888 Y88b.
888 888 "Y888888 888 "Y88888 888 888 "Y888888 "Y888
Welcome to Hardhat v2.19.3
? What do you want to do? …
▸ Create a JavaScript project
Create a TypeScript project
Create a TypeScript project (with Viem)
Create an empty hardhat.config.js
Quit
Open the hardhat.config.js file and paste the below code:
Copy require("dotenv").config();
require("@nomicfoundation/hardhat-toolbox");
/** @type import('hardhat/config').HardhatUserConfig */
module.exports = {
solidity: "0.8.9",
paths: {
artifacts: "./src",
},
networks: {
b2Testnet: {
url: `https://zkevm-rpc.bsquared.network`,
accounts: [process.env.ACCOUNT_PRIVATE_KEY],
},
},
};
Add contract code and scripts
Create a new contract code file, in the contracts folder, named Storage.sol
Copy the below code and paste it in the Storage contract code:
Copy //SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;
contract Storage {
uint256 _count = 0;
function set(uint256 count) public {
_count = count;
}
function get() public view returns (uint256){
return _count;
}
}
Create a new file in the scripts folder deploy-storage.js
Add the code below to the deploy-counter.js file:
Copy const hre = require("hardhat");
async function main() {
const deployedContract = await hre.ethers.deployContract("Storage");
await deployedContract.waitForDeployment();
console.log(
`Storage contract deployed to https://testnet.bsquared.network/address/${deployedContract.target}`
);
}
main().catch((error) => {
console.error(error);
process.exitCode = 1;
});
Before compiling the contract, you need to install the toolbox. You may need to change directory to install outside the project. Use this command:
Copy npm install --save-dev @nomicfoundation/hardhat-toolbox
Compile your contract code (i.e., go back to the project root in the CLI):
Now run the scripts:
Copy npx hardhat run scripts/deploy-storage.js --network b2Testnet
Last updated 10 months ago